Full changelog is here:
http://titanquestgame.com/pcchangelog/TQ_AnniversaryEdition_FullChangelog.txt

GOG Changelog:

Update 1.3 / GOG-3 (Windows) (01 September 2016)

- added Russian and Polish language support.
- fixed and improved the server list
- fixed intro videos not playing
- fixes to default game speed and overall settings

intro video still freezes even after update. I hit ESC and it goes on to game menu.

It's working fine on my computer ?

The game was just updated to GOG4 - don't know what changed though and at the moment it is Galaxy only.

Dang, THQ Nordic putting in some work! I guess they are trying to lose the bad rep. :D

Yeah, I did a reboot and restarted the game (GOG-3) version and then the videos just started working without freezing. Updating to GOG-4 version now. The game looks stunning with the resolution upgrades. Glad I waited to play this now rather than ten years ago. Looking forward to it.

Just updated to the GOG-4 release and now I see the Iron Lore logo video at the beginning where that would not even show before. All working smoothly now after this release for me.

It was fixed with update 3 . BTW for the people who didn't want to download whole installer again , update 4 only changing main Titan Quest executable . TQ.exe . So if you don't have problem already you will wait for a bigger update .

Must have been the complete install I did of GOG-4 then that fixed it for me because with GOG-3 I never saw the Iron Lore logo video ever come up.

GOG Changelog:

Update 1.3 / GOG-4 (Windows) (02 September 2016)

- more changes and improvements to the server list

Update (07 September 2016)

Fixed frozen mouse cursor on some WIndows 10 machines
Fixed missing game fonts on some Windows 10 machines
Increased UI scale for 4k resolutions
Fixed possible crash when using RMB on the pet/party menu
Increased players' initial Life/Mana regeneration by 1 per second
Increased Bleeding Damage on wolves' Maul skill by 1 per second per level
Reduced Physical Damage on Distortion Wave by 15%
Increased Physical Damage on Distortion Wave ~ Chaotic Resonance by 30%
Tweaked Aktaios' (Orient Telkine) skill use
Adjusted Vitality Decay Damage on Aktaios' death beam
Reduced Life Leech and Elemental Resistance on Alastor
Alastor's aura now does Frostburn and Vitality Decay rather than Cold/Vitality Damage once a second
Fixed health of Panos (Centaur Hero)
Tweaked animations on Flaming Boarman
Improved death effect on Scarabaeus
Reduced hero lock radius of golden chests
Fixed name tag on Hector's Flashing Helm
Fixed Defensive Ability on Battlemage Circlet (60 -> 260 like the other set parts)
Adjusted level requirements and costs of Betrayer and Siren affixes
Fixed AI of "Monstrous Brigands" archers
Reduced amount of Arachnos armor dropping in "The Poisoned Spring"
Gave Leimon the Vengeful's zombie summons a limited life span
Improved effect of Arachnos' Ensnare skill
"Headphones" speaker setting is now called "Stereo" to avoid confusion
Edited Eye of Chaos pedestal to avoid possible glitch

If that's the case, why not have posted just TQ.exe for download/update. Another 5,6GB download could have been avoided and to replace TQ.exe is very simple. Oh well. Thanks for the info.

I patched through Galaxy and it was like a 32MB patch.

If GOG provided manual patch files, I think supporting them for many users would be a burden.